2005-06-06:
* infix.cl: bind *read-suppress* in infix-reader to support the
use of infix notation when *read-suppress* is true.
Christophe Rhodes <csr21@cam.ac.uk>
2002-03-04:
* infix.cl: moved definition of infix-error macro to before its
first use.
Christophe Rhodes <csr21@cam.ac.uk>.

Another package by Alan Manuel Gloria can be found here, but it's buggy on expressions like

(nfx 55 - 3 * 4 + 2000000)

(giving -1999957 instead of the correct result 2000043. There seems to be a problem with different operators of the same precedence. Alan Manuel Gloria later got involved in the readable project, which approaches infix notation in a slightly different way.